Research of aerodynamic load of horizontal tail

This article describes two methods, double-lattice method (DLM) and computational fluid dynamics (CFD), computing aerodynamic force. The structural FEM and fluid model of horizontal tail are established in the same software, HYPERMESH. In CFD/CSD (computational structural dynamics) method, the locations of the structural nodes are exactly the same as those of the CFD grid points at the fluid-structure interface. There is no interpolation of loads and displacements between structure and fluid, so this CFD/CSD method is a higher fidelity approach than the other old ones. And the transfer of loads and displacements between the structure and fluid reaches zero error. Aerodynamic loads by DLM and CFD/CSD are calculated respectively, according to the different deflections of horizontal tail. Compared with the results of DLM and CFD/CSD, and experimental data, DLM calculations are obviously lower than those of experiment, and CFD/CSD calculations are close to experimental data. Meantime, the shifting direction of the pressure center in three approaches above is coincided. Based on this calculation, it provides the precious experience for the future horizontal tail design, and it takes an important position in calculating airloads of aircraft and missile wing and empennage surface. In the early design stages of the wing surface, DLM is used to estimate aerodynamic force, while during the detailed design, aerodynamic force is computed by CFD/CSD.